Hi.. Can understand your concern.. As per your complain Parotid gland is one of the major salivary gland and is present in front of the ear one on either side. Any infection in the gland or obstruction in the ducts of the glands can lead to swelling in the gland.. As per your symptoms the swelling increases while eating clearly indicates that there is obstruction in the ducts of the salivary gland leading to swelling.. The obstruction occurs due to formation of crystalline stones within the ducts of the gland from minerals present in saliva leading to blockage of ducts and the formation of stones known as SIALOLITHS can occur secondary to infection in the gland.. When the duct is partially blocked and there is increased saliva flow during eating the saliva flows back to the gland and causes swelling.. You should consult a dentist or an oral pathologist and get evaluated.. In case of sialolith you should take more of sour candies and lemon drops as they will increase saliva flow and small stones can get flushed out along with the saliva.. In case if the stones are large a dentist can palpate the superficial stones along the duct course and push them out of duct.. In case of stones in deeper locations of duct and large stones surgical removal is done.. A technique known as Sialoscopy which is an endoscopy technique can be done to locate the stones and subsequently removed.. Hope this information helps.. If you find the answer helpful kindly write a positive review and click on found this answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora.